Laptop repair tutorial pdf free download

Here is the common use operations and shortcut menu shown in figure Common in ThinkPad and Apple, some models of the latest Lenovo also use this way.

It controls the input device and output device of the computer system, and is a hub connected the software program and hardware device. For the PC, B1OS includes the controlling keyboard, display screen, disk drive, serial communication device and some other functions of the code. This chapter focuses on the boot process and Intel standard timing. In the repair of the laptop, in most cases, Timing applied on the power-on part in the system boot, so also called Power Sequence.

So literally, timing is time and sequence. The motherboard from standby to power-on, and then to CPU work, we feel just a short time. And the motherboard made so much action; it will strictly obey an established order, that is to say, in the process of these steps, if the first step isn't completed.

Then the next step is not start. And there is a strict time requirement between each step, some will be accurate to a few milliseconds, for example, PWRGD Signal generation requires that each voltage stabilize about 5ms will be sent. It can be said that if you master the timing, then you have a basic idea of maintenance for all kinds of faults of the laptop.

Hard starting process in general. The boot process of the laptop with Intel chipset below series 4 is as follows: a Without any electrical equipment supply power no battery and no power , through 3V button battery to produce VCCRTC to supply RTC circuit of the South bridge, to keep the operation of the internal time and save the CMOS information.

The clock signal distribution of above HM65 chipset The clock signal distribution of above HM65 chipset is shown in figure , the characteristic is that it must be 25MHz crystal when the bridge integrates the clock chip.

This chapter introduces three kinds of Compal protective isolation circuit. Then explain one of the Compal standby circuit. The figure of Compal motherboard power interface is shown in In this chapter, as DosXX Dunkel 1.

If Hardware is the 'heart' of a computer system, then Software is its 'soul'. Both are complimentary to each other. Or the screen blank? These faults are probably also due to hardware problems. This is a code that can be used to dis nguish some hardware problems.

These can be due to hardware or soTware problems. Take careful note of all informa on given in the error code.

These error codes are probably due to soTware problems. If so, these are likely culprits. This could be a cause of soTware problems. The Device Manager will list all of the hardware devices installed on a PC. Any device with a problem will have a warning symbol next to it, and double clicking on that device would give d e t a i l s a n d s u g g e s t e d remedies for the problem. Some possible.

This op on will check the applica ons may fail outright if the Hard disk for errors. Some mes this is desirable, some mes not. Either way, this prac ce may slow your computer down to various degrees, and with the program running all the me, may slow down the performance of your computer.

Note: Please use cau on when uninstalling socware. These cyber-threats can cause huge dilemmas to your computer. Note: Modern computers have safeguards that shut down the system if a component is overhea ng. The performance will be slow. This problem is most likely if the computer is rather old and has had a newer and more memory demanding opera ng system installed.

It will reduce the performance of the computer. Check to be sure if the computer is plugged in to an AC outlet properly. It ensures that all of the system's hardware is working properly before trying to load the opera ng system. If the computer does not pass POST, it will not boot. Tip: Make sure the computer turns on. If nothing happens no lights, no sound, no fans, etc. Check to see that all of the cards are fully pressed down into the bus connec ons, that any socketed chips are fully pressed into their sockets, and that all cable connec ons are fully a]ached.

Make sure that the drive cables are a]ached correctly. Dust can cause overhea ng problems and electrical shorts. Some mes, insects will nest inside the case as well. All of this needs to be cleaned out before you close up the case. Take precau ons to avoid inhaling excess dust, and consider using protec ve eyeware if necessary. Some mes the hard disk will become corrupted by a user, or by a virus. Look for recent changes in your system's opera on.

Free laptop service manuals and user guides will help you find what you need. Service manuals show you step by step instructions for replacing components, photos for jobs that are specific to a particular make of machine.

Looking for laptop tips and hints, free manuals links, find help troubleshooting, step by step guides, fixes for different makes of machines and piles of good laptop repair info! Looking for laptop advice, hard drive replacement, data recovery, disassembly guides, bios passwords, laptop overheating, free laptop manuals links, tips and hints how to repair and maintain, step by step guides, check out our Laptop Support Forum where you can find help troubleshooting, fixes for commonly encountered issues on different makes of machines and piles of good laptop repair info!

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